Need help with Formula

I have a Formula SL that I have been running up front on my SS since last summer. I had surgery in the fall and did not ride that bike until Febuary. I found that the brake had no pressure and the handle pulls back almost all the way to my bars. My friend bled it and it seemed a little better but one week later, it was back to the same situation. I only rode it once during the time after the repair. I do not see any type of leakage anywhere.

This is my first disc and I am still new to them. Has anyone had similar problems with any of their brakes? thanks in advance for any advice